Descripe the feature and motivation

with the release of OpenCV 4.7 this PR becomes available so we can add

SEAM_FIND_CHOICES['gc_color'] = cv.detail_GraphCutSeamFinder('COST_COLOR')
SEAM_FIND_CHOICES['gc_colorgrad'] = cv.detail_GraphCutSeamFinder('COST_COLOR_GRAD')

to https://github.com/opencv/opencv/blob/4.x/samples/python/stitching_detailed.py

Previously it was removed since python bindings were corrupt. Thanks to @chinery for fixing this.

Additional context

No response